Invar 42 pipe

Equivalent

Characteristics of alloy

This alloy relates to a group of precision alloys with a defined TCLE (linear expansion thermal coefficient in a range of temperatures -70º +340ºC, not higher than 4.5 — 5.5x10-6/C°) and is used in electrovacuum equipment. Invar is a precision alloy that possesses unique physical, mechanical characteristics (magnetic, elastic, heating, electrical). It differs with a high accuracy of chemical composition, carefulness of manufacture, processability, an absence of residual elements. An actual category relates to high-alloyed alloys. Such precision alloys are manufactured on a basis of iron, nickel, copper, mangan, cobalt. The marking Ni42 means that alloy contains about 42% of nickel.

Percentage composition:

Ni

Cu

P

Mn

Si

C

Fe

S

41.5 — 43

≤0.1

≤0.015

≤ 0.4

≤ 0.3

≤0.03

56.14 — 58.5

≤0.015

Name of this alloy originates from a word «invariant» which means «unchanged» and corresponds a truth because TCLE of invar almost does not change in a temperature range -70º — +340ºC.

Physical characteristics

V/(m/deg)

Degree

MPa

1/Deg

Ohm-m

J/(kg/degree)

kg/m3

20

1,42

580

8200

Mechanical features at a temperature 20 °C.

Product mix

KCU

Thickness

d5

y

sv

sT

Heat treating

F.e.

Hammer-hardened tape, GOST 14 080−78

0,8−1.5

930

Welding:

Type

Description

limitedly weldable

welding is possible at heating to 100−120°С and last heat treating

hardly weldable

in order to obtain a qualitative welded joints, it is necessary to perform the following operations: before welding to heat the details up to 200−300°C, heat treating (annealing) after welding.

Magnetic characteristics

Magnetic T induction, magnetic field strength no less than 100, in magnetic field, [A/m]

B100

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